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“We are opening up this new territory for metamaterials,” says MIT Associate Professor Carlos Portela, who is part of the team behind this research. “You could print a double-network metal or ceramic, and you could get a lot of these benefits, in that it would take more energy to break them, and they would be significantly more stretchable.”
The secret to its added flexibility comes from the knots and entanglements of the thread structure within the lattice frame. This allows it to absorb more stress, and when a crack appears on a strut, it’s unlikely to propagate through because of how the energy is spread unevenly through the material.
“Think of this woven network as a mess of spaghetti tangled around a lattice. As we break the monolithic lattice network, those broken parts come along for the ride, and now all this spaghetti gets entangled with the lattice pieces,” Portela told MIT News. “That promotes more entanglement between woven fibers, which means you have more friction and more energy dissipation.”
You can potentially apply this new technique in semiconductors, allowing manufacturers to build flexible chips that you can install on garments and other wearable accessories. Furthermore, the research team is exploring the use of two different materials for the structure. One example is to use polymers that react differently to temperature, so that the material becomes softer and more compliant in cold environments, while harder and more rigid in hot temperatures.
While we’re unlikely to see this being applied to wearable tech within the next year, these advancements give us a glimpse of the possibilities of tomorrow. Perhaps we’d see smart clothing or advanced wearables powered by chips using this technology in the future.
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